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Authors PB Laursen, CM Shing, JM Peake, JS Coombes, DG Jenkins
Title   Influence of high-intensity interval training on adaptations in 
well-trained cyclists
Full source     Journal of Strength and Conditioning Research, 2005, Vol 19, 
Iss 3, pp 527-533

The purpose of the present study was to examine the influence of 3 different 
high-intensity interval training regimens on the first and second ventilatory 
thresholds (VT1 and VT2), anaerobic capacity (ANC), and plasma volume (PV) in 
well-trained endurance cyclists. Before and after 2 and 4 weeks of training, 38 
well-trained cyclists (Vo(2)peak = 64.5  5.2 ml center dot kg(-1)-min(-1) 
performed (a) a progressive cycle test to measure Vo(2)peak, peak power output 
(PPO), VT1, and VT2; (b) a time to exhaustion test (T-max) at their Vo(2) peak 
power output (P-max); and (c) a 40-km time-trial (TT40). Subjects were assigned 
to 1 of 4 training groups (group 1: n = 8, 8 X 60% T-max P-max 1:2 
work-recovery ratio; group 2: n = 9, 8 X 60% T-max at P-max, recovery at 65% 
maximum heart rate; group 3: n = 10, 12 X 30 seconds at 175% PPO, 4.5-minute 
recovery; control group: n = 11). The TT,, performance, Vo(2)peak, VT1, VT2, 
and ANC were all significantly increased in groups 1, 2, and 3 (p < 0.05) but 
not in the control group. However, PV did not change in response to the 4-week 
training program. Changes in TT,, performance were modestly related to the 
changes in Vo(2)peak, VT1, VT2, and ANC (r = 0.41, 0.34, 0.42, and 0.40, 
respectively; all p < 0.05). In conclusion, the improvements in TT40 
performance were related to significant increases in Vo(2)peak, VT1, VT2, and 
ANC but were not accompanied by significant changes in PV. Thus, peripheral 
adaptations rather than central adaptations are likely responsible for the 
improved performances witnessed in well-trained endurance athletes following 
various forms of high-intensity interval training programs.

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